Johan Land has a life that stands out even among Silicon Valley’s tech elite: He’s the lead product manager at Waymo (formerly known as Google’s self-driving car project), a job that keeps him glued to computer screens and fixated on the future. Excelling at his work, Land said, requires an obsessive focus on it. But maintaining that passion — especially with his fourth child on the way — means knowing when to detach. Land’s secret to success: relaxing with a glass of wine in the back yard alongside his wife, kids and the family’s 13 chickens and three sheep. It’s...